Suppose a large mixing tank initially contains 300 gallons of water in which they have been dissolved 50 pounds of salt. Another salty solution is pumped into the tank at a rate of 3 gallons per minute, and when the solution is well mixed, it is pumped towards out at a rate of less than 2 gallons per minute. If the shrinkage of the entering solution is 2 lb/gal, determine a differential equation for the quantity A(t) of salt present in the tank at time t. what will be the differential equation if The well-mixed solution is pumped out to a rate greater than 3.5 gallons per minute?

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